Câu hỏi :

I owed Bill a favor. I agreed to help him.

A I only agreed to help Bill because I owed him some money.

B If I hadn’t owed Bill a favor, I would have agreed to help him.

C It was only because I owed Bill a favor that I agreed to help him.

D Although I owed Bill a favor, I agreed to help him.

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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